Application of genetic algorithms for optimization of a FSS reflectarray antenna

In this paper we describe the design and optimization of a reflectarray antenna with an offset feed. The reflectarmy is formed by a layer of frequency selective surface (FSS), e.g., a gangbuster surface above the ground plane. Phase synthesis on the reflectarray surface is achieved by varying local geometry of the FSS layer. Genetic Algorithm is used to shape the far field radiation pattern io the broadside direction and to reduce level of side lobes.